org.lobid.lodmill.OaiDcEncoder.java Source code

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Here is the source code for org.lobid.lodmill.OaiDcEncoder.java

Source

/* Copyright 2013 Jan Schnasse.
 * Licensed under the Eclipse Public License 1.0 */
package org.lobid.lodmill;

import java.io.StringWriter;

import org.apache.commons.lang3.StringEscapeUtils;
import org.culturegraph.mf.framework.DefaultStreamPipe;
import org.culturegraph.mf.framework.ObjectReceiver;
import org.culturegraph.mf.framework.StreamReceiver;
import org.culturegraph.mf.framework.annotations.Description;
import org.culturegraph.mf.framework.annotations.In;
import org.culturegraph.mf.framework.annotations.Out;

/**
 * The XML Encoder takes the result of a morph an treats all literal names as
 * tag names and all literal values as tag values. The start and end of the
 * result can be modified using the setXmlPraeambel and setXmlPostambel methods.
 * 
 * @author Jan Schnasse
 * 
 */
@Description("Encodes streams in oai_dc xml. Takes the result of a morph "
        + "an treats all literal names as tag names and all literal values as " + "tag values.")
@In(StreamReceiver.class)
@Out(String.class)
public final class OaiDcEncoder extends DefaultStreamPipe<ObjectReceiver<String>> {
    private final StringWriter writer = new StringWriter();
    private final String xmlPraeambel = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n" + "<oai_dc:dc \n"
            + "\txmlns:oai_dc=\"http://www.openarchives.org/OAI/2.0/oai_dc/\" \n"
            + "\txmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" \n"
            + "\txmlns:dcterms=\"http://purl.org/dc/terms/\" xmlns:dc=\"http://purl.org/dc/elements/1.1/\" \n"
            + "\txsi:schemaLocation=\"http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd\">\n";
    private final String xmlPostambel = "</oai_dc:dc>\n";

    @Override
    public void startRecord(final String id) {
        final StringBuffer buffer = writer.getBuffer();
        buffer.delete(0, buffer.length());
        writer.write(xmlPraeambel);
    }

    @Override
    public void endRecord() {
        writer.write(xmlPostambel);
        String result = writer.toString();
        if (getReceiver() != null)
            getReceiver().process(result);
    }

    @Override
    public void literal(final String name, final String value) {
        writer.write("<" + name + ">\n\t");
        writer.write(StringEscapeUtils.escapeXml(value));
        writer.write("\n</" + name + ">\n");
    }
}